CVE-2026-88173CWE-367CWE-416

CVE-2026-88173

High · published October 13, 2026

CVSS v3.1
8.1
EPSS
1%
Percentile
42.3
In the wild
Unconfirmed
What it is

Use after free in Windows Background Intelligent Transfer Service (BITS) allows an unauthorized attacker to execute code over a network.

The record
Technical detail
CVSS v3.1
8.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00506 · 42.3th percentile
Weaknesses
CWE-367 · Time-of-check Time-of-use (TOCTOU) Race Condition; CWE-416 · Use After Free
Published
2026-10-13T23:21Z
Affected products (10)
ProductVersionsFixed in
microsoft/windows_10_1607< 10.0.14393.961210.0.14393.9612
microsoft/windows_10_1607< 10.0.14393.961210.0.14393.9612
microsoft/windows_10_1809< 10.0.17763.937610.0.17763.9376
microsoft/windows_10_1809< 10.0.17763.937610.0.17763.9376
microsoft/windows_server_2012all versions—
microsoft/windows_server_2012all versions—
microsoft/windows_server_2016< 10.0.14393.961210.0.14393.9612
microsoft/windows_server_2019< 10.0.17763.937610.0.17763.9376
microsoft/windows_server_2022< 10.0.20348.576110.0.20348.5761
microsoft/windows_server_2025< 10.0.26100.3365010.0.26100.33650
References (1)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88173 · [email protected]
EPSS history
Timeline
  • 15 OCT 03:35Z
    EPSS moved — → 1%
    epss
  • 13 OCT 19:00Z
    Windows Background Intelligent Transfer Service (BITS) Remote Code Execution Vulnerability
    cvelistv5
  • 13 OCT 19:00Z
    Windows Background Intelligent Transfer Service (BITS) Remote Code Execution Vulnerability
    cvelistv5